Leach for tanbark.



Patented Aug. 29, I899.

No. 63I,840.

LEAGH FOB TAN BARK.

(Application filed Jan. 20, 1899.)

(No Model.)

WITNESSES 0PM Wm Y W: udnms mini 00.. Pnol'o-Lflun, maximum. 04 c.

UNITED STATES PATENT EErcE.

JAMES D. WOOD, OF RAPSON, MICHIGAN.

LEACH FOR TANBARK.

SPECIFICATION forming part of Letters Patent No. 631,840, dated August29, 1899. Application filed January 20, 1899. Serial No. 702,874. (Nomodel.)

To all whom, it may concern:

Be it known that I, JAMES D. 700D, acitizen of the United States,residing at Rapson, in the county of Huron, State of Michigan, haveinvented certain new and useful Improvements in Leaches; and I dodeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

This invention relates to new and useful improvements in leaches forleaching tanbark; and it consists in the construction and arrangement ofparts, as hereinafter fully set forth, and pointed out particularly inthe claim.

The object of the invention is to provide cheap and efiective means formaintaining a continuous circulation of the boiling liquor through thebark in the le'ach, to obviate the boiling over and wasting of saidliquor, and to enable the circulating liquor to be heated to a higherdegree of heat, thereby enabling the soluble matter of the bark to bemore quickly and perfectly removed by the process of infiltration,producing a liquor of greater strength, which object is attained by theconstruction illustrated in the accompanying drawings, in which- Figurel is a central vertical section thro ugh a leaching-vat provided with myimproved features. Fig. 2 is an enlarged perspective view of the top ofthe leaching-vat and the vertical well therein. Fig. 3 is an enlargedperspective of the hood or cap adapted to cover the upper end of saidWell and having a hollow elbow extending therefrom.

Referring to the letters of reference, A designates the leaching vat orchamber, in which the bark is boiled. This vat may be made in anydesired form and is provided near the lower end with a false perforatedbottom B, upon which the bark is supported and which forms a chamber 0between its under face and the true bottom of the vat. Within thischamber 0 are coils of pipe D, having suitable induct and eductconnections a and b, respectively, through which a circulation of livesteam is maintained through said coils to heat the liquor in the leach.

E designates a well which extends vertically of the leaching-vat, thoughseparate therefrom and embraced within the wall thereof, the lower endof said well having apertures 6, through which communication isestablished with the chamber 0 below the perforated bottom D of theleach. This well is triangular in form, and the top of that portionthereof which extends into the vat is provided with a lateral flange c.

F designates a hood or cover for the well E, which is also triangularand provided on two of its sides with a depending right-angled flange(Z, forming a groove or way f in the inner face of said flange d, thatreceives the flange c at the top of said well and locks said hoodthereto when placed thereon, as shown in Fig. 1. This hood is slid ontothe well from the inner point thereof, so that said flange 0 mayproperly engage in the way f in the depending flange d of said hood,whose back edge or side h closes against the face of the upper end 'i ofthe outer wall of the well when in position thereon. Through the centerof said hood or cover is an aperture m, which communicates with anopening a, passing through an elbow G, which is attached to said cover.The discharge end of this elbow when the cover is in position on thewell extends inward toward the center of the vat, so that any liquorpassing upward through said elbow will be discharged into the top ofsaid vat.

H designates a pipe through which the liquor is drawn from the leach tobe cooled ready for use, said pipe communicating with the bottom of thewell E through a nipple 0, the aperture in which being closed by a plugr,havin g the operating-rod 8 attached thereto, which stands verticallywithin said well.

Crossing the top of the leach or vat is a pipe I, which conveys themenstruum or solvent liquor to the leach, said pipe being provided witha rotary sprinkler J, which depends therefrom over the top of said vatand distributes the liquor over the top of the bark K until the vat isfilled. h

In the operation of this improved device, the vat being filled with barkand liquor,

- said vat, through which and the perforated bottom 13 it percolates tochamber G, from which it again passes upward through the well, and so onthe liquor continues to circulate upward through the well and backthrough the bark in the v'at to the heatingchamber while said liquor ismaintained at the boiling-point. Thus the liquor at a high temperatureis continuously passed through the bark in the vat, whereby the solublematter in the bark is more readily extracted and a liquor of greaterstrength is produced, at the same time obviating the boiling over andwasting of the liquor incident to leaches wherein no provision is madefor a circulation of the boiling liquor through the well and vat.

Having thus fully set forth my invention, what I claim as new, anddesire to secure by Letters Patent, is

In an apparatus for leaching, the combination of the vat having a falseperforated bottom and a heating-chamber below said bot- Y tom, thevertical well formed within the wall of the vat but separated therefrom,said well communicating at its lower end directly with a said chamber,the upper end of said wall terminating flush with the top of said vat, aremovable cover covering the top of said well, an elbow mounted on thecover and communicating with the well therethrough, the discharge end ofthe elbow extending over the top of said vat.

In testimony whereof I afiix my signature in presence of two witnesses.

JAMES D. 00D.

Witnesses:

FRED P. WATRoUs, WILLIA HARBRON.

